About: Synthesis and pH- and salinity-controlled self-assembly of novel amphiphilic block-gradient copolymers of styrene and acrylic acid

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	A novel type of amphiphilic ionic copolymer comprising a hydrophilic poly(acrylic acid) (PAA) block and an amphiphilic poly(acrylic acid)-grad-poly(styrene) (PAA-grad-PS) copolymer block was synthesized using a one step direct nitroxide-mediated polymerization. The aggregation behaviour of the copolymers in the aqueous medium was studied by small-angle neutron scattering and dynamic light scattering and by transmission electron microscopy in a wide range of pHs and ionic strengths. It has been demonstrated that PAA-b-(PAA-grad-PS) copolymers are soluble in alkaline water at room temperature without special experimental procedures and self-assemble into nano-scale aggregates at low/moderate pH and/or high ionic strength. In contrast to “frozen aggregates formed by PAA-b-PS copolymers in aqueous media, the micelles of PAA-b-(PAA-grad-PS) amphiphilic copolymers can reversibly change their aggregation number upon a variation in the pH or salinity of the solution. A novel type of amphiphilic ionic copolymer comprising a hydrophilic poly(acrylic acid) (PAA) block and an amphiphilic poly(acrylic acid)-grad-poly(styrene) (PAA-grad-PS) copolymer block was synthesized using a one step direct nitroxide-mediated polymerization. The aggregation behaviour of the copolymers in the aqueous medium was studied by small-angle neutron scattering and dynamic light scattering and by transmission electron microscopy in a wide range of pHs and ionic strengths. It has been demonstrated that PAA-b-(PAA-grad-PS) copolymers are soluble in alkaline water at room temperature without special experimental procedures and self-assemble into nano-scale aggregates at low/moderate pH and/or high ionic strength. In contrast to “frozen aggregates formed by PAA-b-PS copolymers in aqueous media, the micelles of PAA-b-(PAA-grad-PS) amphiphilic copolymers can reversibly change their aggregation number upon a variation in the pH or salinity of the solution. (en)
Title	Synthesis and pH- and salinity-controlled self-assembly of novel amphiphilic block-gradient copolymers of styrene and acrylic acid Synthesis and pH- and salinity-controlled self-assembly of novel amphiphilic block-gradient copolymers of styrene and acrylic acid (en)
skos:prefLabel	Synthesis and pH- and salinity-controlled self-assembly of novel amphiphilic block-gradient copolymers of styrene and acrylic acid Synthesis and pH- and salinity-controlled self-assembly of novel amphiphilic block-gradient copolymers of styrene and acrylic acid (en)
skos:notation	RIV/61389013:_____/12:00379206!RIV13-AV0-61389013
http://linked.open...avai/predkladatel	Ústav makromolekulární chemie AV ČR, v. v. i.
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GAP208/10/1600), Z(AV0Z40500505)
http://linked.open...iv/cisloPeriodika	29
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Štěpánek, Petr Bakaeva, Zulfiya
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav makromolekulární chemie AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	172937
http://linked.open...ai/riv/idVysledku	RIV/61389013:_____/12:00379206
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	block-gradient copolymers; light scattering; small-angle neutron scattering (en)
http://linked.open.../riv/klicoveSlovo	small-angle neutron scattering light scattering block-gradient copolymers
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[9975908B673E]
http://linked.open...i/riv/nazevZdroje	Soft Matter
http://linked.open...in/vavai/riv/obor	CF
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	8 (xsd:int)
http://linked.open...vavai/riv/projekt	Polymeric particles and nanostructured materials stabilized by surface active molecules
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	8
http://linked.open...iv/tvurceVysledku	Štěpánek, Petr Grassl, B. Bakaeva, Zulfiya Billon, L. Borisov, O. Borisova, O. Lapp, A. Zaremski, M.
http://linked.open...ain/vavai/riv/wos	000305981600017
http://linked.open...n/vavai/riv/zamer	Progresivní makromolekulární materiály a supramolekulární systémy: syntéza a studium vlastností, jevů a možností využití pro speciální aplikace a moderní technologie
issn	1744-683X
number of pages	11 (xsd:int)
http://bibframe.org/vocab/doi	10.1039/C2SM25625H
is http://linked.open...avai/riv/vysledek of	Synthesis and pH- and salinity-controlled self-assembly of novel amphiphilic block-gradient copolymers of styrene and acrylic acid

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